Time division multiplex communication control system

• US 5,784,365 A
• Filed: 02/26/1996
• Issued: 07/21/1998
• Est. Priority Date: 05/25/1995
• Status: Expired due to Term

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Ikeda, Tadashi
• Primary Examiner(s): Kizou, Hassan
• Application Number:
  US08/607,024
• Time in Patent Office: 876 Days
• Field of Search: 370/321, 370/326, 370/330, 370/336, 370/337, 370/345, 370/347, 370/437, 370/442, 370/522, 319/59, 319/63, 455/33.1, 455/34.1, 455/54.1, 455/63
• US Class Current: 370/337
• CPC Class Codes: H04B 7/2643 using time-division multiple access [TDMA] H04B7/2615, H04B7/2618 take precedence

Abstract

A time division multiplex communication control system for controlling assignment of communication channels from a switching office to mobile stations in which control on the switching office side is automatically effected so that communication channels having a high likelihood of communication disturbances are lastly assigned. In one embodiment, the communication channels located immediately adjacent to the control channel and having a high likelihood of communication disturbances from control channel signals are lastly assigned. In another embodiment in which two carriers are available and the control channel is located in the first carrier, communication channels in the second carrier are first automatically assigned and, when a communication channel is not available in the second carrier, a communication channel is the first carrier which is not adjacent to the control channel is assigned.

Claims

1. A time division multiplex communication control system comprising a switching office and a plurality of mobile stations, wherein communication signals are sent over at least one carrier having a plurality of time division multiplexed communication channels and a control channel, in which said switching office assigns a communication channel to a mobile station requesting acquisition of a communication channel through said control channel, characterized in that when said mobile station requests the acquisition of a communication channel from said switching office through said control channel, said switching office assigns to said mobile station a communication channel which is not adjacent to said control channel with priority over a communication channel which is adjacent to said control channel.

2. A time division multiplex communication control system according to claim 1, wherein at least one of the communication channels located immediately adjacent to the control channel is not assigned to any mobile station.

3. A time division multiplex communication control system according to claim 2, wherein a communication channel to be assigned with priority over other communication channels is on the same carrier as said other communication channels.

4. A time division multiplex communication control system according to claim 3, wherein the communication channel to be assigned with priority on the same carrier is assigned in ascending order from a small communication channel number.

5. A time division multiplex communication control system according to claim 3, wherein the communication channel to be assigned with priority on the same carrier is assigned in descending order from a large communication channel number .

6. A time division multiplex communication control system according to claim 1, wherein the communication channel located immediately after the control signal channel is not assigned to any mobile station.

7. A time division multiplex communication control system according to claim 1, wherein a communication channel to be assigned with priority over other communication channels is on the same carrier as said other communication channels.

8. A time division multiplex communication control system according to claim 7, wherein a communication channel to be assigned with priority on the same carrier is assigned in ascending order from a small communication channel number.

9. A time division multiplex communication control system according to claim 7, wherein a communication channel to be assigned with priority on the same carrier is assigned in descending order from a large communication channel number.

10. A time division multiplex communication control system according to claim 1, wherein the communication channel located immediately after the control channel is assigned only after all other communication channels have been assigned to mobile stations.

11. A time division multiplex communication control system comprising a switching office and a plurality of mobile stations, wherein communication signals are sent over at least two carriers, each having a plurality of time division multiplexed communication channels and wherein a first carrier has a control channel, in which a switching office assigns a communication channel to a mobile station requesting acquisition of a communication channel through a control channel of said first carrier, characterized in that when said mobile station requests the acquisition of a communication channel from said switching office through said control channel, said switching office assigns to said mobile station a communication channel of said second carrier with priority over communication channels of said first carrier, and when a communication channel of said second carrier is not available, said switching office assigns to said mobile station a communication channel of said first carrier not adjacent to said control channel of said first carrier with priority over a communication channel which is adjacent to said control channel.

12. A time division multiplex communication control system according to claim 11, wherein at least one of the communication channels of said first carrier located immediately before and after the control channel is not assigned to any mobile station.

13. A time division multiplex communication control system according to claim 12, wherein a communication channel to be assigned with priority over other communication channels is on the same carrier as said other communication channels.

14. A time division multiplex communication control system according to claim 13, wherein the communication channel to be assigned with priority on the same carrier is assigned in ascending order from a small communication channel number.

15. A time division multiplex communication control system according to claim 13, wherein a communication channel to be assigned with priority on the same carrier is assigned in descending order from a large communication channel number.

16. A time division multiplex communication control system according to claim 11, wherein the communication channel of said first carrier located immediately after the control channel is not assigned to any mobile station.

17. A time division multiplex communication control system according to claim 11, wherein a communication channel to be assigned with priority over other communication channels is on the same carrier as said other communication channels.

18. A time division multiplex communication control system according to claim 17, wherein a communication channel to be assigned with priority on the same carrier is assigned in ascending order from a small communication channel number.

19. A time division multiplex communication control system according to claim 17, wherein a communication channel to be assigned with priority on the same carrier is assigned in descending order from a large communication channel number.

20. A time division multiplex communication control system according to claim 11, wherein the communication channel of said first carrier located immediately after the control channel is assigned only after all other communication channels have been assigned to mobile stations.